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A business can mean an income-producing activity that regularly sells goods or services, or the organization through which that activity is carried out. The word alone does not tell you the business’s legal form, tax classification, or size. In the United States, those questions are shaped by federal tax rules, state law, and the particular size framework being used.
What makes an activity a business?
A business may earn income from selling products, providing services, professional practice, or real-estate activity. Some businesses are operated by an individual; others are formed as legal entities with defined owners and formal obligations. An activity can be a business without being a corporation or LLC.
Revenue is money received from customers, while profit is what remains after expenses. A business may have revenue without making a profit, especially during startup or investment periods. Its structure can affect ownership, personal-liability exposure, tax filings, paperwork, and access to financing.
What are the different types of business ownership?
Common U.S. business structures include sole proprietorships, partnerships, corporations, and limited liability companies (LLCs). Their availability and details depend on applicable law, including state law. The Small Business Administration (SBA) says business structure affects taxes, the ability to raise money, paperwork, and personal liability.
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| Structure | Basic ownership and liability | Key considerations |
|---|---|---|
| Sole proprietorship | One individual owns an unincorporated business; generally, the business is not legally separate from the owner. | It is relatively simple to form and gives the owner control, but the owner may be personally exposed to business debts and cannot raise capital by selling stock. |
| Partnership | Two or more people own a business together. | General, limited, and limited-liability partnership forms can allocate control and liability differently. The agreement and applicable state law matter. |
| Corporation | A separate legal entity owned by shareholders. | A C corporation can raise capital through stock and can continue independently of a shareholder. It generally has more recordkeeping, and profits may be taxed at both corporate and shareholder levels. |
| LLC | An entity formed under state law, owned by members. | It can offer liability separation, but protection is not absolute. Its federal income-tax classification depends on membership and elections. |
Legal form and tax classification are different
An S corporation is a federal tax status or election available to eligible corporations; it is not simply another state-law entity alongside an LLC. Forming an entity and choosing or qualifying for a federal tax classification are distinct questions.
For federal income-tax purposes, a domestic single-member LLC is generally disregarded as separate from its owner unless it elects corporate treatment. A domestic LLC with multiple members is generally treated as a partnership unless it elects corporate treatment. Employment and certain excise tax rules may differ from this income-tax treatment. Check IRS guidance and state requirements for the situation at hand.
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How should you compare business structures?
There is no single best structure for every business. The SBA notes that ownership rules, liability, taxes, and filing requirements can vary by state. Use these questions as a starting point, not as individualized legal or tax advice:
- Who can own the business, and how many owners will there be?
- What personal-liability exposure could owners face?
- How will federal and state taxes apply, and are any elections available?
- Will the business need outside funding or the ability to issue stock?
- What formation steps, records, and ongoing filings are required?
- How will the business continue or transfer if an owner leaves?
For formation decisions, consult current IRS and SBA guidance and the relevant state agency. A small-business startup guide book may also help organize launch questions, but it does not replace professional advice.
What is a small business?
“Small,” “medium,” and “large” do not have one universal definition. The answer depends on the country and the framework being used, such as a lender’s criteria, a statute, or a federal program. Avoid treating a simple employee-count ladder as a definitive classification.
For covered U.S. federal programs and contracting, the SBA sets size standards by industry. Standards generally use employee counts or average annual receipts, and affiliates may need to be included in the calculation. A concern must also meet general requirements, including being for-profit, independently owned and operated, and not nationally dominant in its field.
To assess eligibility, identify the relevant North American Industry Classification System (NAICS) code and check the current SBA Size Standards Tool or table. SBA standards apply to specified programs; they are not a universal definition for every business, lender, law, or country.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Can a business be run by one person?
Yes. An individual can operate a business, including as a sole proprietor. The activity can be a business without being a corporation or LLC.
What is the difference between an LLC and a corporation?
Both are legal forms that can separate business obligations from owners’ personal affairs, subject to applicable law and circumstances. Corporations have shareholders and a formal corporate governance structure; LLCs are formed under state statutes and generally offer more flexible management. Their tax treatment also differs by classification and elections, so compare the rules that apply in your state and situation.
Is an S corporation a type of LLC?
No. S corporation refers to a federal tax status or election for eligible entities, not a state-law entity type. An LLC may elect corporate tax treatment if eligible, but entity formation and tax classification remain separate questions.
How many employees can a small business have?
There is no single employee limit that defines every small business. For SBA programs, the applicable industry-specific standard may use employees or average annual receipts, and affiliation rules may affect the calculation.
Does forming an LLC guarantee personal liability protection?
No structure should be treated as an absolute guarantee. An LLC can provide liability separation under applicable law, but the result depends on the circumstances and compliance with relevant requirements. Consult a qualified professional about a particular situation.
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